knock at WOT

[TurboGN86]

ok guys just got the car out the shop for a blown head gasket. car runs great again... but i took it out and did a WOT pull on the street and saw 6.0 of knock. what do i need to check to get this issues fixed. im not replacing another headgasket.

car is an 87 WE4 Te-44, 60# injectors with matched TT chip, 3"THDP, 3" single shot, and stretched stock location intercooler. the car is up there in milage. all i have to tune with is a scan master. just not sure what im lookin at most of the time lol.

 

[getdowngranny]

How much boost? Where is your fuel pressure at? You changed the head gasket but you didnt fix the problem that caused it to blow in the first place.

 

[Fast4Ward]

diagnosing knock can be a pita.
i suggest you dial the boost down to 5-10 with some 93 octane if that's all you can get at the pump.
there is a huge list of things to check when chasing down this problem.
does it go away after keeping the pedal to the floor?...ruling out false knock can be nerve racking.

 

[TurboGN86]

im kina scared to try keeping my foot in the gas since it says 6.0 i will take the boost down tomorrow and see what happens any other ideas

 

[Red C5]

What kind of gas you running? In CA we have 91 but I know other states have 93 which helps.

 

[GNRick]

Worn out spark plugs and wires, weak fuel pump could be places to start.

 

[Timbuick]

Is fuel pressure rising in line with boost?

 

[TurboGN86]

to answer the first question i miessed last night, the problem of knocking was fixed. the A/C braket was rattling and caused the car to detonate on start up and blew the head gasket.

Im running 93 octane and i do not have a FP guage in the car, its on the fuel rail.

 

[87NAT]

to answer the first question i miessed last night, the problem of knocking was fixed. the A/C braket was rattling and caused the car to detonate on start up and blew the head gasket.

Im running 93 octane and i do not have a FP guage in the car, its on the fuel rail.

??????????

Thats not your problem. False knock will not blow a gasket...all it will do is pull timing.

Your leaning out on top. Fuel pump or some of the other isues that the guys mentioned.

 

[TurboGN86]

im gonna turn down the boost when i get this transmission changed. i noticed it was peaking at alsmost 20#'s and on 93 octane thats probly my problem.

 

[allblackcars]

Ditto